New function RSA_check_key.

diff --git a/crypto/rsa/rsa_chk.c b/crypto/rsa/rsa_chk.c
new file mode 100644 (file)
index 0000000..2462c5e
--- /dev/null
+++ b/crypto/rsa/rsa_chk.c
@@ -0,0 +1,159 @@
+/* crypto/rsa/rsa_chck.c  -*- Mode: C; c-file-style: "eay" -*- */
+/* ====================================================================
+ * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include <openssl/bn.h>
+#include <openssl/err.h>
+#include <openssl/rsa.h>
+
+
+int RSA_check_key(RSA *key)
+       {
+       BIGNUM *i, *j, *k, *l, *m;
+       BN_CTX *ctx;
+       int ret=1;
+       
+       i = BN_new();
+       j = BN_new();
+       k = BN_new();
+       l = BN_new();
+       m = BN_new();
+       ctx = BN_CTX_new();
+       if (i == NULL || j == NULL || k == NULL || l == NULL ||
+               m == NULL || ctx == NULL)
+               {
+               RSAerr(RSA_F_RSA_CHECK_KEY, ERR_R_MALLOC_FAILURE);
+               goto err;
+               }
+       
+       /* p prime? */
+       if (BN_is_prime(key->p, BN_prime_checks, NULL, NULL, NULL) != 1)
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_P_NOT_PRIME);
+               }
+       
+       /* q prime? */
+       if (BN_is_prime(key->q, BN_prime_checks, NULL, NULL, NULL) != 1)
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_Q_NOT_PRIME);
+               }
+       
+       /* n = p*q? */
+       BN_mul(i, key->p, key->q, ctx);
+       if (BN_cmp(i, key->n) != 0)
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_N_DOES_NOT_EQUAL_PQ);
+               }
+       
+       /* dmp1 = d mod (p-1)? */
+       BN_sub(i, key->p, BN_value_one());
+       BN_mod(j, key->d, i, ctx);
+       if (BN_cmp(j, key->dmp1) != 0)
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_DMP1_NOT_CONGRUENT_TO_D);
+               }
+       
+       /* dmq1 = d mod (q-1)? */    
+       BN_sub(i, key->q, BN_value_one());
+       BN_mod(j, key->d, i, ctx);
+       if (BN_cmp(j, key->dmq1) != 0)
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_DMQ1_NOT_CONGRUENT_TO_D);
+               }
+       
+       /* iqmp = q^-1 mod p? */
+       BN_mod_inverse(i, key->q, key->p, ctx);
+       if (BN_cmp(i, key->iqmp) != 0)
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_IQMP_NOT_INVERSE_OF_Q);
+               }
+       
+       /* d*e = 1  mod lcm(p-1,q-1)? */
+       BN_sub(i, key->p, BN_value_one());
+       BN_sub(j, key->q, BN_value_one());
+       /* now compute k = lcm(i,j) */
+       BN_mul(l, i, j, ctx);
+       BN_gcd(m, i, j, ctx);
+       BN_div(k, NULL, l, m, ctx); /* remainder is 0 */
+       BN_mod_mul(i, key->d, key->e, k, ctx);
+       if (!BN_is_one(i))
+               {
+               ret = 0;
+               if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)
+                       goto err;
+               RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_DE_NOT_CONGRUENT_TO_1);
+               }
+       
+ err:
+       if (i != NULL) BN_free(i);
+       if (j != NULL) BN_free(j);
+       if (k != NULL) BN_free(k);
+       if (l != NULL) BN_free(l);
+       if (m != NULL) BN_free(m);
+       if (ctx != NULL) BN_CTX_free(ctx);
+       return (ret);
+       }